Lindsey Vonn thinks her new titanium knee could start a trend in skiing. And pro sports in general

ST. MORITZ, Switzerland (AP) — When Lindsey Vonn last raced on the World Cup circuit nearly six years ago, the constant pain in her knee left her in tears and led to retirement.

​ ST. MORITZ, Switzerland (AP) — When Lindsey Vonn last raced on the World Cup circuit nearly six years ago, the constant pain in her knee left her in tears and led to retirement. Read More Breaking News, Latest News and Videos | CNN